"traceback error" for some addons
The traceback is part of the programmer's tool kit which can be generated when the program has an abnormal termination. The traceback error documents exactly what problem was encountered, how the program got to that point, and exactly what the computer had been doing when the problem occurred. For the developer, it is an invaluable tool in tracking down a bug. For someone who is unfamiliar with the code and architecture of Blender and addons to Blender, it seems so much gobbledygook. 

If you run into this type of traceback, and decide to file a bug report, making a screenshot of the traceback and including it with the bug report can be useful to someone who is going to try to fix the bug.